Research: CMM: honor D2B/B2D opt-out for dual-PCS profiles

[xsscx]

Research

2026-08-05 14:22:40 UTC

1. CIccXform::Create() selects a spectral DToB/BToD tag merely because spectralPCS exists, despite bUseD2BxB2DxTags=false
2. For profiles carrying both colorimetric and spectral PCS this conflicts with CIccCmm::AddXform()’s colorimetric connection metadata which can select a transform with incompatible channel counts
3. Expected: D2B/B2D only on explicit opt-in except for spectral-only profiles; reject any selected transform whose sample counts disagree with the CMM connection spaces

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